Explain with suitable examples how can you retrieve information from multiple tables Database management system vtu

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Explain with suitable examples, how can you retrieve information from multiple tables? - Database management system vtu

Appeared in Database Management System - 2016 question paper

Asked On2017-07-06 05:31:00 by:Aparna-Dasgupta

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For example, for the Corporate Librarian to display a list of contributing authors with their long form department name requires data from the REPORT table (author) and data from the DEPARTMENT table (department name). Obtaining the data you need requires the ability to combine two or more tables. This process is commonly referred to as "joining the tables".

Two or more tables can be combined to form a single table by using the join operation. The join operation is based on the premise that there is a logical association between two tables based on a common attribute that links the tables. Therefore, there must be a common column in each table for a join operation to be executed. For example, both the REPORT table and the DEPARTMENT table have the department identification code in common. Thus, they can be joined.

Joining two tables in Texis is accomplished by using a SELECT statement. The general form of the SELECT statement when a join operation is involved is:

SELECT column-name1 [,column-name2] ...

FROM table-name1, table-name2

WHERE table-name1.column-name = table-name2.column-name ;

Answerd on:2017-07-11 Answerd By:Amogh

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Explain with suitable examples, how can you retrieve information from multiple tables? - Database management system vtu

Appeared in Database Management System - 2016 question paper

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